Volume 19 Issue 4
Aug.  2023
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ZHANG Feng, TANG Hao, LIU Wei, SUN Qiuyang, ZHU Meixi, ZHANG Can, SHAN Chenxu, GUO Xuhao. Comparative analysis of dynamic stability characteristics of T0 and T90 codends[J]. South China Fisheries Science, 2023, 19(4): 21-30. DOI: 10.12131/20230018
Citation: ZHANG Feng, TANG Hao, LIU Wei, SUN Qiuyang, ZHU Meixi, ZHANG Can, SHAN Chenxu, GUO Xuhao. Comparative analysis of dynamic stability characteristics of T0 and T90 codends[J]. South China Fisheries Science, 2023, 19(4): 21-30. DOI: 10.12131/20230018
shu

Comparative analysis of dynamic stability characteristics of T0 and T90 codends

  • 1.

    College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China

  • 2.

    National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China

  • 3.

    Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China

  • 4.

    Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China

  • 5.

    Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China

More Information
  • Received Date: February 12, 2023
  • Revised Date: March 08, 2023
  • Accepted Date: March 20, 2023
  • Available Online: March 10, 2023
    Graphical Abstract
    • Abstract
  • Changing mesh orientation is a key appraoch to enhancing codend selectivity, but it may also alter the hydrodyna-mic performance of the codend. In order to quantify the differences in hydrodynamic and stability between T0 (A diamond mesh) and T90 (A 90° turned mesh) codends, we investigated the hydrodynamic characteristics, geometric shape, and fluttering motions of T0 and T90 codends with different twine diameters under varying flow velocities and catch sizes in a flume tank. Results show that the mesh opening angle in the middle part of T90 codend was approximately 1.2 times larger than of T0 codend. Moreover, the middle section of T90 codend had less shrinkage and greater width than T0 codend. The drag of T90 codend was, on average, larger than that of T0 codend and increased by 1.09 times with the simulative catch size. During the catch stage, the amplitude of the drag oscillations of the codend increased with increasing flow velocity and catch size, with T90 codend exhibiting larger amplitudes than T0 codend. There was no significant correlation between longitudinal displacement amplitude of the empty codend and current speed. Additionally, longitudinal displacement oscillations amplitudes in T0 codend were higher than those in T90 codend. The longitudinal displacement oscillations amplitudes in both codends increased with catch size and current speed, but decreased with twine diameter. The use of a thick diameter T90 codend can improve selectivity and stability, and increase the hydraulic resistance of the codend. The findings of this study can be applied to enhance the hydrodynamic characteristics, selectivity and stability of mid-water trawl codend.
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    • References (31)
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